feat: add /host-sys volume mount and HOST_SYS_PATH environment variable for sysfs serial fallback and SMART health detection

Add HOST_SYS_PATH=/host-sys to .env.example and app.py config with /host-sys default. Update _device_serial() to check HOST_SYS_PATH/class/block and HOST_SYS_PATH/block before fallback /sys paths for serial reads. Update raid_status() SMART regex to match both "SMART overall-health self-assessment test result" and "SMART Health Status" with case-insensitive flag for NVMe/SSD compatibility. Add /

docker-compose.yml

@@ -7,6 +7,11 @@ services:
       - "8099:8099"
     devices:
       - "${RAID_DEVICE:-/dev/md127}:${RAID_DEVICE:-/dev/md127}"
+    cap_add:
+      - SYS_RAWIO
+    device_cgroup_rules:
+      - "b 8:* rwm"
+      - "b 9:* rwm"
     extra_hosts:
       - "host.docker.internal:host-gateway"
     env_file:
@@ -20,6 +25,8 @@ services:
       - ${DATASTORE_HOST_PATH:-/nesflix}:/nesflix:ro
       # Read-only Host-Devices für lsblk/smartctl; Media Max führt keine RAID-Schreiboperationen aus.
       - /dev:/host-dev:ro
+      # Read-only Hardware-Metadaten für Seriennummern und SMART-Zuordnung.
+      - /sys:/host-sys:ro
       - ./data:/data
     networks:
       - media